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sources/tech/20190806 Bash Script to Automatically Start a Services When it Goes Down on Linux.md
546 lines
11 KiB
Markdown
546 lines
11 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Bash Script to Automatically Start a Services When it Goes Down on Linux)
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[#]: via: (https://www.2daygeek.com/linux-bash-script-auto-restart-services-when-down/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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Bash Script to Automatically Start a Services When it Goes Down on Linux
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======
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There are many open source monitoring tools are currently available in market to monitor Linux systems performance.
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Those are send an email alert when the system reaches the specified threshold limit for CPU, Memory, and Disk space or any service is down.
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But, it doesn’t have an intelligence to auto start the services, if it crash/goes down.
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There are various reasons for the process to crash, which you can investigate and fix the issue but it may take a while.
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If you don’t want to make your service down for a while and if you would like to bring them up immediately whenever it goes down?
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If so, what to do in this situation? How to mitigate this?
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We can write our own bash script to start a service whenever it goes down. Writing a shell script is not a big deal and you have to understand few things to achieve this.
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Once you familiar on this, you can write your own shell script to automate the day to day activities, which will save lots of time.
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We had added many useful shell scripts in the past. If you want to check those, navigate to the below link.
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* **[How to automate day to day activities using shell scripts?][1]**
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I have added totally six shell scripts for this usage and you can choose which one is suitable for you.
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I had applied different commands and methodology in each shell script.
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**`Note:`**` ` You need to change the email id instead of ours.
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### 1) How to Automatically Start a Service When it Goes Down on SysVinit Linux System?
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Use the following bash script, if you would like to start a single service in SysVinit Linux System.
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I have added **`httpd`**` ` service in this script but you can add the service, which you want to monitor.
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```
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# vi /opt/scripts/service-monitor.sh
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#!/bin/bash
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serv=httpd
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sstat=stopped
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service $serv status | grep -i 'running\|stopped' | awk '{print $3}' | while read output;
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do
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echo $output
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if [ "$output" == "$sstat" ]; then
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service $serv start
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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else
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echo "$serv service is running"
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fi
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done
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```
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Set an executable permission to **`service-monitor.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor.sh
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```
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Alternatively, you can use the following script.
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```
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# vi /opt/scripts/service-monitor-1.sh
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#!/bin/bash
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serv=httpd
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sstat=$(pidof $serv | wc -l )
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if [ $sstat -gt 0 ]
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then
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echo "$serv is running fine!!!"
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else
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echo "$serv is down/dead"
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service $serv start
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echo "$serv service is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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fi
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```
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Set an executable permission to **`service-monitor-1.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-1.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-1.sh
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```
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### 2) How to Automatically Start a Service When it Goes Down on systemd Linux System?
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Use the following bash script, if you would like to start a single service in systemd Linux System.
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I have added **`httpd`**` ` service in this script but you can add the service, which you want to monitor.
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```
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# vi /opt/scripts/service-monitor-2.sh
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#!/bin/bash
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serv=httpd
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sstat=dead
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systemctl status $serv | grep -i 'running\|dead' | awk '{print $3}' | sed 's/[()]//g' | while read output;
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do
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echo $output
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if [ "$output" == "$sstat" ]; then
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systemctl start $serv
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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else
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echo "$serv service is running"
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fi
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done
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```
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Set an executable permission to **`service-monitor-2.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-2.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-2.sh
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```
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Alternatively, you can use the following script.
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```
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# vi /opt/scripts/service-monitor-3.sh
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#!/bin/bash
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serv=httpd
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sstat=$(pidof $serv | wc -l )
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if [ $sstat -gt 0 ]
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then
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echo "$serv is running fine!!!"
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else
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echo "$serv is down/dead"
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systemctl start $serv
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echo "$serv service is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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fi
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```
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Set an executable permission to **`service-monitor-3.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-3.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-3.sh
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```
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### 3) How to Automatically Start Multiple Services When it Goes Down on SysVinit Linux System?
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Use the following bash script, if you would like to start multiple service in SysVinit Linux System.
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I have added **`httpd`**` ` and **`rsyslog`**` ` services in this script but you can add the service, which you want to monitor.
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```
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# vi /opt/scripts/service-monitor-4.sh
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#!/bin/bash
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sstat=stopped
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for serv in httpd rsyslog
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do
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service $serv status | grep -i 'running\|stopped' | awk '{print $3}' | while read output;
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do
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echo $output
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if [ "$output" == "$sstat" ]; then
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service $serv start
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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else
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echo "$serv service is running"
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fi
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done
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done
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```
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Set an executable permission to **`service-monitor-4.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-4.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-4.sh
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```
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Alternatively, you can use the following script.
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```
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# vi /opt/scripts/service-monitor-5.sh
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#!/bin/bash
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for serv in rsyslog httpd
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do
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sstat=$(pgrep $serv | wc -l )
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if [ $sstat -gt 0 ]
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then
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echo "$serv is running!!!"
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else
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echo "$serv is down/dead"
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service $serv start
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echo "$serv serv is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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fi
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done
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```
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Set an executable permission to **`service-monitor-5.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-5.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-5.sh
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```
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### 4) How to Automatically Start Multiple Service When it Goes Down on systemd Linux System?
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Use the following bash script, if you would like to start multiple services in systemd Linux System.
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I have added **`httpd`**` ` and **`rsyslog`**` ` services in this script but you can add the service, which you want to monitor.
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```
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# vi /opt/scripts/service-monitor-6.sh
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#!/bin/bash
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sstat=dead
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for serv in httpd rsyslog
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do
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systemctl status $serv | grep -i 'running\|dead' | awk '{print $3}' | sed 's/[()]//g' | while read output;
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do
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echo $output
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if [ "$output" == "$sstat" ]; then
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systemctl start $serv
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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else
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echo "$serv service is running"
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fi
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done
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done
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```
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Set an executable permission to **`service-monitor-6.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-6.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-6.sh
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```
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Alternatively, you can use the following script.
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```
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# vi /opt/scripts/service-monitor-7.sh
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#!/bin/bash
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for serv in rsyslog httpd
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do
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sstat=$(pgrep $serv | wc -l )
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if [ $sstat -gt 0 ]
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then
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echo "$serv is running!!!"
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else
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echo "$serv is down/dead"
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systemctl start $serv
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echo "$serv serv is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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fi
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done
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```
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Set an executable permission to **`service-monitor-7.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-7.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-7.sh
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```
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### 5) How to Automatically Start a Service When it Goes Down on systemd and SysVinit Linux System?
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Use the following bash script, if you would like to start a service in systemd and SysVinit Linux System.
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I have added **`httpd`**` ` service in this script but you can add the service, which you want to monitor.
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```
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# vi /opt/scripts/service-monitor-8.sh
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#!/bin/bash
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smanager=$(ps -p1 | grep "init\|systemd" | awk '{print $4}')
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serv=httpd
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if (( $(pidof $serv | wc -l) > 0 ))
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then
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echo "$serv is running!!!"
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elif [ "$smanager" == "init" ]
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then
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service $serv start
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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else
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systemctl start $serv
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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fi
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```
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Set an executable permission to **`service-monitor-8.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-8.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-8.sh
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```
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### 6) How to Automatically Start Multiple Services When it Goes Down on systemd and SysVinit Linux System?
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Use the following bash script, if you would like to start multiple services in systemd and SysVinit Linux System.
|
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|
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I have added **`httpd`**` ` and **`rsyslog`**` ` services in this script but you can add the service, which you want to monitor.
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```
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# vi /opt/scripts/service-monitor-9.sh
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#!/bin/bash
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smanager=$(ps -p1 | grep "init\|systemd" | awk '{print $4}')
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for serv in rsyslog httpd
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do
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if (( $(pgrep $serv | wc -l) > 0 ))
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then
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echo "$serv is running!!!"
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elif [ "$smanager" == "init" ]
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then
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service $serv start
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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else
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systemctl start $serv
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echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
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fi
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done
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```
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Set an executable permission to **`service-monitor-9.sh`**` ` file.
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```
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$ chmod +x /opt/scripts/service-monitor-9.sh
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```
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Finally add a cronjob to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/5 * * * * /bin/bash /opt/scripts/service-monitor-9.sh
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/linux-bash-script-auto-restart-services-when-down/
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||
作者：[Magesh Maruthamuthu][a]
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||
选题：[lujun9972][b]
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||
译者：[译者ID](https://github.com/译者ID)
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||
校对：[校对者ID](https://github.com/校对者ID)
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||
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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||
[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/category/shell-script/
|